SHOW

DESC, DESCRIBE

It shows the column information of a table, and it’s like a SHOW COLUMNS statement. For more details, see SHOW COLUMNS.

DESC tbl_name;
DESCRIBE tbl_name;

EXPLAIN

It shows the column information of a table, and it’s like a SHOW COLUMNS statement. For more details, see SHOW COLUMNS.

EXPLAIN tbl_name;

SHOW TABLES

It shows the list of all table names within a database. The name of the result column will be tables_in_<database name> and it will have one column. If you use the LIKE clause, you can search the table names matching this and if you use the WHERE clause, you can search table names with more general terms. SHOW FULL TABLES displays the second column, table_type together. The table must have the value, BASE TABLE and the view has the value, VIEW.

SHOW [FULL] TABLES [LIKE 'pattern' | WHERE expr];

The following shows the examples of this syntax.

SHOW TABLES;
Tables_in_demodb
======================
  'athlete'
  'code'
  'event'
  'game'
  'history'
  'nation'
  'olympic'
  'participant'
  'record'
  'stadium'
SHOW FULL TABLES;
  Tables_in_demodb     Table_type
============================================
  'athlete'             'BASE TABLE'
  'code'                'BASE TABLE'
  'event'               'BASE TABLE'
  'game'                'BASE TABLE'
  'history'             'BASE TABLE'
  'nation'              'BASE TABLE'
  'olympic'             'BASE TABLE'
  'participant'         'BASE TABLE'
  'record'              'BASE TABLE'
  'stadium'             'BASE TABLE'
SHOW FULL TABLES LIKE '%c%';
  Tables_in_demodb      Table_type
============================================
  'code'                'BASE TABLE'
  'olympic'             'BASE TABLE'
  'participant'         'BASE TABLE'
  'record'              'BASE TABLE'
SHOW FULL TABLES WHERE table_type = 'BASE TABLE' and TABLES_IN_demodb LIKE '%co%';
  Tables_in_demodb      Table_type
============================================
  'code'                'BASE TABLE'
  'record'              'BASE TABLE'

SHOW COLUMNS

It shows the column information of a table. You can use the LIKE clause to search the column names matching it. If you use the WHERE clause, you can search column names with more general terms like, “General Considerations for All SHOW Statements.”.

SHOW [FULL] COLUMNS {FROM | IN} tbl_name [LIKE 'pattern' | WHERE expr];

If a FULL keyword is used, it shows the additional information, collation and comment.

SHOW FIELDS is the same statement as SHOW COLUMNS.

The DESCRIBE (abbreviated DESC) statement and the EXPLAIN statement provide the same information with SHOW COLUMNS, but they don’t support LIKE clause or WHERE clause.

This query has the following columns:

Column name Type Description
Field VARCHAR Column name
Type VARCHAR Column data type
Null VARCHAR If you can store NULL, the value is YES; if not, it is NO
Key VARCHAR
Whether a column has an index or not. If there is more than one key value in the given column of a table, this displays only the one that appears first in the order of PRI, UNI and MUL.
  • If the key is a space, the column doesn’t have an index, it is not the first column in the multiple column index or the index is non-unique.
  • If the value is PRI, it is a primary key or the primary key of multiple columns.
  • If the value is UNI, it is a unique index. (The unique index allows multiple NULL values but you can also set a NOT NULL constraint.)
  • If the value is MUL, it is the first column of the non-unique index that allows the given value to be displayed in the column several times. If the column composes a composite unique index, the value will be MUL. The combination of column values can be unique but the value of each column can appear several times.
Default VARCHAR Default value defined in the column
Extra VARCHAR Additional information available on the given column. For the column with AUTO_INCREMENT constraint, it shows the ‘auto_increment’.

The following shows the examples of this syntax.

SHOW COLUMNS FROM athlete;
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
  'name'                'VARCHAR(40)'         'NO'       ''           NULL                  ''
  'gender'              'CHAR(1)'             'YES'      ''           NULL                  ''
  'nation_code'         'CHAR(3)'             'YES'      ''           NULL                  ''
  'event'               'VARCHAR(30)'         'YES'      ''           NULL                  ''
SHOW COLUMNS FROM athlete WHERE field LIKE '%c%';
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
  'nation_code'         'CHAR(3)'             'YES'      ''           NULL                  ''
SHOW COLUMNS FROM athlete  WHERE "type" = 'INTEGER' and "key"='PRI' AND extra='auto_increment';
  Field                 Type                  Null       Key          Default               Extra
================================================================================================================
  'code'                'INTEGER'             'NO'       'PRI'        NULL                  'auto_increment'
SHOW FULL COLUMNS FROM athlete WHERE field LIKE '%c%';
  Field                 Type                  Collation             Null                  Key                   Default               Extra                 Comment
================================================================================================================================================================================
  'code'                'INTEGER'             NULL                  'NO'                  'PRI'                 NULL                  'auto_increment'      NULL
  'nation_code'         'CHAR(3)'             'iso88591_bin'        'YES'                 ''                    NULL                  ''                    NULL

SHOW INDEX

It shows the index information.

SHOW {INDEX | INDEXES | KEYS } {FROM | IN} tbl_name;

This query has the following columns:

Column name Type Description
Table VARCHAR Table name
Non_unique INTEGER
Unique or not
  • 0: Duplicated value is not allowed
  • 1: Duplicated value is allowed
Key_name VARCHAR Index name
Seq_in_index INTEGER Serial number of the column in the index. Starts from 1.
Column_name VARCHAR Column name
Collation VARCHAR Method of sorting columns in the index. ‘A’ means ascending and NULL means not sorted.
Cardinality INTEGER The number of values measuring the unique values in the index. Higher cardinality increases the opportunity of using an index. This value is updated every time SHOW INDEX is executed. Note that this is an approximate value.
Sub_part INTEGER The number of bytes of the indexed characters if the columns are indexed partially. NULL if all columns are indexed.
Packed   Shows how keys are packed. If they are not packed, it will be NULL. Currently no support.
Null VARCHAR YES if a column can include NULL, NO if not.
Index_type VARCHAR Index to be used (currently, only the BTREE is supported.)
Func VARCHAR A function which is used in a function-based index
Comment VARCHAR Comment to describe the index
Visible VARCHAR Shows the Visibility of an index (YES/NO)

The following shows the examples of this syntax.

SHOW INDEX IN athlete;
Table                  Non_unique  Key_name              Seq_in_index  Column_name           Collation             Cardinality     Sub_part  Packed                Null                  Index_type            Func                  Comment               Visible
=================================================================================================================================================================================================================================================================================
'athlete'                       0  'pk_athlete_code'                1  'code'                'A'                          6677         NULL  NULL                  'NO'                  'BTREE'               NULL                  NULL                  'YES'
CREATE TABLE tbl1 (i1 INTEGER , i2 INTEGER NOT NULL, i3 INTEGER UNIQUE, s1 VARCHAR(10), s2 VARCHAR(10), s3 VARCHAR(10) UNIQUE);

CREATE INDEX i_tbl1_i1 ON tbl1 (i1 DESC);
CREATE INDEX i_tbl1_s1 ON tbl1 (s1 (7));
CREATE INDEX i_tbl1_i1_s1 ON tbl1 (i1, s1);
CREATE UNIQUE INDEX i_tbl1_i2_s2 ON tbl1 (i2, s2);

ALTER INDEX i_tbl1_s1 ON tbl1 INVISIBLE;

SHOW INDEXES FROM tbl1;
Table                  Non_unique  Key_name              Seq_in_index  Column_name           Collation             Cardinality     Sub_part  Packed                Null                  Index_type            Func                  Comment               Visible
=================================================================================================================================================================================================================================================================================
'tbl1'                          1  'i_tbl1_i1'                      1  'i1'                  'D'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_i1_s1'                   1  'i1'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_i1_s1'                   2  's1'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'i_tbl1_i2_s2'                   1  'i2'                  'A'                             0         NULL  NULL                  'NO'                  'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'i_tbl1_i2_s2'                   2  's2'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          1  'i_tbl1_s1'                      1  's1'                  'A'                             0            7  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'NO'
'tbl1'                          0  'u_tbl1_i3'                      1  'i3'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'
'tbl1'                          0  'u_tbl1_s3'                      1  's3'                  'A'                             0         NULL  NULL                  'YES'                 'BTREE'               NULL                  NULL                  'YES'

SHOW COLLATION

It lists collations supported by the database. If LIKE clause is present, it indicates which collation names to match.

SHOW COLLATION [ LIKE 'pattern' ];

This query has the following columns:

Column name Type Description
Collation VARCHAR Collation name
Charset CHAR(1) Charset name
Id INTEGER Collation ID
Built_in CHAR(1) Built-in collation or not. Built-in collations are impossible to add or remove because they are hard-coded.
Expansions CHAR(1) Collation with expansion or not. For details, see Expansion.
Strength CHAR(1) The number of levels to be considered in comparison, and the character order can be different by this number. For details, see Collation Properties.

The following shows the examples of this syntax.

SHOW COLLATION;
  Collation             Charset                        Id  Built_in              Expansions            Strength
===========================================================================================================================
  'euckr_bin'           'euckr'                         8  'Yes'                 'No'                  'Not applicable'
  'iso88591_bin'        'iso88591'                      0  'Yes'                 'No'                  'Not applicable'
  'iso88591_en_ci'      'iso88591'                      3  'Yes'                 'No'                  'Not applicable'
  'iso88591_en_cs'      'iso88591'                      2  'Yes'                 'No'                  'Not applicable'
  'utf8_bin'            'utf8'                          1  'Yes'                 'No'                  'Not applicable'
  'utf8_de_exp'         'utf8'                         76  'No'                  'Yes'                 'Tertiary'
  'utf8_de_exp_ai_ci'   'utf8'                         72  'No'                  'Yes'                 'Primary'
  'utf8_en_ci'          'utf8'                          5  'Yes'                 'No'                  'Not applicable'
  'utf8_en_cs'          'utf8'                          4  'Yes'                 'No'                  'Not applicable'
  'utf8_es_cs'          'utf8'                         85  'No'                  'No'                  'Quaternary'
  'utf8_fr_exp_ab'      'utf8'                         94  'No'                  'Yes'                 'Tertiary'
  'utf8_gen'            'utf8'                         32  'No'                  'No'                  'Quaternary'
  'utf8_gen_ai_ci'      'utf8'                         37  'No'                  'No'                  'Primary'
  'utf8_gen_ci'         'utf8'                         44  'No'                  'No'                  'Secondary'
  'utf8_ja_exp'         'utf8'                        124  'No'                  'Yes'                 'Tertiary'
  'utf8_ja_exp_cbm'     'utf8'                        125  'No'                  'Yes'                 'Tertiary'
  'utf8_km_exp'         'utf8'                        132  'No'                  'Yes'                 'Quaternary'
  'utf8_ko_cs'          'utf8'                          7  'Yes'                 'No'                  'Not applicable'
  'utf8_ko_cs_uca'      'utf8'                        133  'No'                  'No'                  'Quaternary'
  'utf8_tr_cs'          'utf8'                          6  'Yes'                 'No'                  'Not applicable'
  'utf8_tr_cs_uca'      'utf8'                        205  'No'                  'No'                  'Quaternary'
  'utf8_vi_cs'          'utf8'                        221  'No'                  'No'                  'Quaternary'
SHOW COLLATION LIKE '%_ko_%';
  Collation             Charset                        Id  Built_in              Expansions            Strength
===========================================================================================================================
  'utf8_ko_cs'          'utf8'                          7  'Yes'                 'No'                  'Not applicable'
  'utf8_ko_cs_uca'      'utf8'                        133  'No'                  'No'                  'Quaternary'

SHOW TIMEZONES

It shows the timezone information which the current CUBRID supports.

SHOW [FULL] TIMEZONES [ LIKE 'pattern' ];

If FULL is not specified, one column which has timezone’s region names is displayed. The name of this column is timezone_region.

If FULL is specified, four columns which have timezone information are displayed.

If LIKE clause is present, it indicates which timezone_region names to match.

Column name Type Description
timezone_region VARCHAR(32) Timezone region name
region_offset VARCHAR(32) Offset of timezone (daylight saving time is not considered)
dst_offset VARCHAR(32) Offset of daylight saving time (applied to timezone region) which is currently considered
dst_abbreviation VARCHAR(32) An abbreviation of the daylight saving time which is currently applied for the region

The information listed for the second, third and fourth columns is for the current date and time.

If a timezone region doesn’t have daylight saving time rules at all then the dst_offset and dst_abbreviation columns will contain NULL values.

If at the current date, there aren’t daylight saving time rules that apply, then dst_offset will be set to 0 and dst_abbreviation will be the empty string.

The LIKE condition without the WHERE condition is applied on the first column. The WHERE condition may be used to filter the output.

SHOW TIMEZONES;
timezone_region
======================
'Africa/Abidjan'
'Africa/Accra'
'Africa/Addis_Ababa'
'Africa/Algiers'
'Africa/Asmara'
'Africa/Asmera'
...
'US/Michigan'
'US/Mountain'
'US/Pacific'
'US/Samoa'
'UTC'
'Universal'
'W-SU'
'WET'
'Zulu'
SHOW FULL TIMEZONES;
timezone_region       region_offset         dst_offset            dst_abbreviation
===================================================================================
'Africa/Abidjan'      '+00:00'              '+00:00'              'GMT'
'Africa/Accra'        '+00:00'              NULL                  NULL
'Africa/Addis_Ababa'  '+03:00'              '+00:00'              'EAT'
'Africa/Algiers'      '+01:00'              '+00:00'              'CET'
'Africa/Asmara'       '+03:00'              '+00:00'              'EAT'
'Africa/Asmera'       '+03:00'              '+00:00'              'EAT'
...
'US/Michigan'         '-05:00'              '+00:00'              'EST'
'US/Mountain'         '-07:00'              '+00:00'              'MST'
'US/Pacific'          '-08:00'              '+00:00'              'PST'
'US/Samoa'            '-11:00'              '+00:00'              'SST'
'UTC'                 '+00:00'              '+00:00'              'UTC'
'Universal'           '+00:00'              '+00:00'              'UTC'
'W-SU'                '+04:00'              '+00:00'              'MSK'
'WET'                 '+00:00'              '+00:00'              'WET'
'Zulu'                '+00:00'              '+00:00'              'UTC'
SHOW FULL TIMEZONES LIKE '%Paris%';
timezone_region       region_offset         dst_offset            dst_abbreviation
========================================================================================
'Europe/Paris'        '+01:00'              '+00:00'              'CET'

SHOW GRANTS

It shows the permissions associated with the database user accounts.

SHOW GRANTS FOR 'user';

The following shows the examples of this syntax.

CREATE TABLE testgrant (id INT);
CREATE USER user1;
GRANT INSERT,SELECT ON testgrant TO user1;

SHOW GRANTS FOR user1;
  Grants for USER1
======================
  'GRANT INSERT, SELECT ON testgrant TO USER1'

SHOW CREATE TABLE

When a table name is specified, It shows the CREATE TABLE statement of the table.

SHOW CREATE TABLE table_name;
SHOW CREATE TABLE nation;
  TABLE                 CREATE TABLE
============================================
  'nation'               'CREATE TABLE [nation] ([code] CHARACTER(3) NOT NULL,
[name] CHARACTER VARYING(40) NOT NULL, [continent] CHARACTER VARYING(10),
[capital] CHARACTER VARYING(30),  CONSTRAINT [pk_nation_code] PRIMARY KEY  ([code]))
COLLATE iso88591_bin'

SHOW CREATE TABLE statement does not display as the user’s written syntax. For example, the comment that user wrote is not displayed, and table names and column names are always displayed as lower case letters.

SHOW CREATE VIEW

It shows the corresponding CREATE VIEW statement if view name is specified.

SHOW CREATE VIEW view_name;

The following shows the examples of this syntax.

SHOW CREATE VIEW db_class;
  View              Create View
========================================
  'db_class'       'SELECT c.class_name, CAST(c.owner.name AS VARCHAR(255)), CASE c.class_type WHEN 0 THEN 'CLASS' WHEN 1 THEN 'VCLASS' ELSE
                   'UNKNOW' END, CASE WHEN MOD(c.is_system_class, 2) = 1 THEN 'YES' ELSE 'NO' END, CASE WHEN c.sub_classes IS NULL THEN 'NO'
                   ELSE NVL((SELECT 'YES' FROM _db_partition p WHERE p.class_of = c and p.pname IS NULL), 'NO') END, CASE WHEN
                   MOD(c.is_system_class / 8, 2) = 1 THEN 'YES' ELSE 'NO' END FROM _db_class c WHERE CURRENT_USER = 'DBA' OR {c.owner.name}
                   SUBSETEQ (  SELECT SET{CURRENT_USER} + COALESCE(SUM(SET{t.g.name}), SET{})  FROM db_user u, TABLE(groups) AS t(g)  WHERE
                   u.name = CURRENT_USER) OR {c} SUBSETEQ (  SELECT SUM(SET{au.class_of})  FROM _db_auth au  WHERE {au.grantee.name} SUBSETEQ
                   (  SELECT SET{CURRENT_USER} + COALESCE(SUM(SET{t.g.name}), SET{})  FROM db_user u, TABLE(groups) AS t(g)  WHERE u.name =
                   CURRENT_USER) AND  au.auth_type = 'SELECT')'

SHOW ACCESS STATUS

SHOW ACCESS STATUS statement displays login information regarding database accounts. Only database’s DBA account can use this statement.

SHOW ACCESS STATUS [LIKE 'pattern' | WHERE expr] ;

This statement displays the following columns.

Column name Type Description
user_name VARCHAR(32) DB user’s account
last_access_time DATETIME Last time that the database user accessed
last_access_host VARCHAR(32) Lastly accessed host
program_name VARCHAR(32) The name of client program(broker_cub_cas_1, csql ..)

The following shows the result of running this statement.

SHOW ACCESS STATUS;
  user_name last_access_time last_access_host program_name
=============================================================================
  'DBA' 08:19:31.000 PM 02/10/2014 127.0.0.1 'csql'
  'PUBLIC' NULL NULL NULL

Note

The above login information which SHOW ACCESS STATUS shows is initialized when the database is restarted, and this query is not replication in HA environment; therefore, each node shows the different result.

SHOW EXEC STATISTICS

It shows statistics information of executing query.

  • To start collecting @collect_exec_stats statistics information, configure the value of session variable @collect_exec_stats to 1; to stop, configure it to 0.
  • It outputs the result of collecting statistics information.
    • The SHOW EXEC STATISTICS statement outputs four part of data page statistics information; data_page_fetches, data_page_dirties, data_page_ioreads, and data_page_iowrites. The result columns consist of variable column (name of statistics name) and value column (value of statistics value). Once the SHOW EXEC STATISTICS statement is executed, the statistics information which has been accumulated is initialized.
    • The SHOW EXEC STATISTICS ALL statement outputs all items of statistics information.

For details, see statdump.

SHOW EXEC STATISTICS [ALL];

The following shows the examples of this syntax.

-- set session variable @collect_exec_stats as 1 to start collecting the statistical information.
SET @collect_exec_stats = 1;
SELECT * FROM db_class;

-- print the statistical information of the data pages.
SHOW EXEC STATISTICS;
variable                value
===============================
'data_page_fetches'     332
'data_page_dirties'     85
'data_page_ioreads'     18
'data_page_iowrites'    28
SELECT * FROM db_index;

-- print all of the statistical information.
SHOW EXEC STATISTICS ALL;
variable                                value
============================================
'file_creates'                          0
'file_removes'                          0
'file_ioreads'                          6
'file_iowrites'                         0
'file_iosynches'                        0
'data_page_fetches'                     548
'data_page_dirties'                     34
'data_page_ioreads'                     6
'data_page_iowrites'                    0
'log_page_ioreads'                      0
'log_page_iowrites'                     0
'log_append_records'                    0
'log_archives'                          0
'log_start_checkpoints'                 0
'log_end_checkpoints'                   0
'log_wals'                              0
'page_locks_acquired'                   13
'object_locks_acquired'                 9
'page_locks_converted'                  0
'object_locks_converted'                0
'page_locks_re-requested'               0
'object_locks_re-requested'             8
'page_locks_waits'                      0
'object_locks_waits'                    0
'tran_commits'                          3
'tran_rollbacks'                        0
'tran_savepoints'                       0
'tran_start_topops'                     6
'tran_end_topops'                       6
'tran_interrupts'                       0
'btree_inserts'                         0
'btree_deletes'                         0
'btree_updates'                         0
'btree_covered'                         0
'btree_noncovered'                      2
'btree_resumes'                         0
'btree_multirange_optimization'         0
'query_selects'                         4
'query_inserts'                         0
'query_deletes'                         0
'query_updates'                         0
'query_sscans'                          2
'query_iscans'                          4
'query_lscans'                          0
'query_setscans'                        2
'query_methscans'                       0
'query_nljoins'                         2
'query_mjoins'                          0
'query_objfetches'                      0
'query_holdable_cursors'                0
'sort_io_pages'                         0
'sort_data_pages'                       0
'network_requests'                      88
'adaptive_flush_pages'                  0
'adaptive_flush_log_pages'              0
'adaptive_flush_max_pages'              0
'prior_lsa_list_size'                   0
'prior_lsa_list_maxed'                  0
'prior_lsa_list_removed'                0
'heap_stats_bestspace_entries'          0
'heap_stats_bestspace_maxed'            0

Diagnostics

SHOW VOLUME HEADER

It shows the volume header of the specified volume in one row.

SHOW VOLUME HEADER OF volume_id;

This query has the following columns:

Column name Type Description
Volume_id INT Volume identifier
Magic_symbol VARCHAR(100) Magic value for for a volume file
Io_page_size INT Size of DB volume
Purpose VARCHAR(32) Volume purposes, ‘Permanent data purpose’ or ‘Temporary data purpose’
Type VARCHAR(32) Volume type, ‘Permanent Volume’ or ‘Temporary Volume’
Sector_size_in_pages INT Size of sector in pages
Num_total_sectors INT Total number of sectors
Num_free_sectors INT Number of free sectors
Num_max_sectors INT Maximum number of sectors
Hint_alloc_sector INT Hint for next sector to be allocated
Sector_alloc_table_size_in_pages INT Size of sector allocation table in page
Sector_alloc_table_first_page INT First page of sector allocation table
Page_alloc_table_size_in_pages INT Size of page allocation table in page
Page_alloc_table_first_page INT First page of page allocation table
Last_system_page INT Last system page
Creation_time DATETIME Database creation time
Db_charset INT Charset number of database
Checkpoint_lsa VARCHAR(64) Lowest log sequence address to start the recovery process of this volume
Boot_hfid VARCHAR(64) System Heap file for booting purposes and multi volumes
Full_name VARCHAR(255) The full path of volume
Next_volume_id INT Next volume identifier
Next_vol_full_name VARCHAR(255) The full path of next volume
Remarks VARCHAR(64) Volume remarks

The following shows the examples of this syntax.

-- csql> ;line on
SHOW VOLUME HEADER OF 0;
<00001> Volume_id                       : 0
        Magic_symbol                    : 'MAGIC SYMBOL = CUBRID/Volume at disk location = 32'
        Io_page_size                    : 16384
        Purpose                         : 'Permanent data purpose'
        Type                            : 'Permanent Volume'
        Sector_size_in_pages            : 64
        Num_total_sectors               : 512
        Num_free_sectors                : 459
        Num_max_sectors                 : 512
        Hint_alloc_sector               : 0
        Sector_alloc_table_size_in_pages: 1
        Sector_alloc_table_first_page   : 1
        Last_system_page                : 1
        Creation_time                   : 09:46:41.000 PM 05/23/2017
        Db_charset                      : 3
        Checkpoint_lsa                  : '(0|12832)'
        Boot_hfid                       : '(0|41|50)'
        Full_name                       : '/home1/brightest/CUBRID/databases/demodb/demodb'
        Next_volume_id                  : -1
        Next_vol_full_name              : ''
        Remarks                         : ''

SHOW LOG HEADER

It shows the header information of an active log file.

SHOW LOG HEADER [OF file_name];

If you omit OF file_name, it shows the header information of a memory; if you include OF file_name, it shows the header information of file_name.

This query has the following columns:

Column name Type Description
Volume_id INT Volume identifier
Magic_symbol VARCHAR(32) Magic value for log file
Magic_symbol_location INT Magic symbol location from log page
Creation_time DATETIME Database creation time
Release VARCHAR(32) CUBRID Release version
Compatibility_disk_version VARCHAR(32) Compatibility of the database against the current release of CUBRID
Db_page_size INT Size of pages in the database
Log_page_size INT Size of log pages in the database
Shutdown INT Was the log shutdown
Next_trans_id INT Next transaction identifier
Num_avg_trans INT Number of average transactions
Num_avg_locks INT Average number of object locks
Num_active_log_pages INT Number of pages in the active log portion
Db_charset INT Charset number of database
First_active_log_page BIGINT Logical pageid at physical location 1 in active log
Current_append VARCHAR(64) Current append location
Checkpoint VARCHAR(64) Lowest log sequence address to start the recovery process
Next_archive_page_id BIGINT Next logical page to archive
Active_physical_page_id INT Physical location of logical page to archive
Next_archive_num INT Next log archive number
Last_archive_num_for_syscrashes INT Last log archive needed for system crashes
Last_deleted_archive_num INT Last deleted archive number
Backup_lsa_level0 VARCHAR(64) LSA of backup level 0
Backup_lsa_level1 VARCHAR(64) LSA of backup level 1
Backup_lsa_level2 VARCHAR(64) LSA of backup level 2
Log_prefix VARCHAR(256) Log prefix name
Has_logging_been_skipped INT Whether or not logging skipped
Perm_status VARCHAR(64) Reserved for future expansion
Backup_info_level0 VARCHAR(128) detail information of backup level 0. currently only backup start-time is used
Backup_info_level1 VARCHAR(128) detail information of backup level 1. currently only backup start-time is used
Backup_info_level2 VARCHAR(128) detail information of backup level 2. currently only backup start-time is used
Ha_server_state VARCHAR(32) current ha state, one of flowing value: na, idle, active, to-be-active, standby, to-be-standby, maintenance, dead
Ha_file VARCHAR(32) ha replication status, one of following value: clear, archived, sync
Eof_lsa VARCHAR(64) EOF LSA
Smallest_lsa_at_last_checkpoint VARCHAR(64) The smallest LSA of the last checkpoint, can be NULL LSA
Next_mvcc_id BIGINT The next MVCCID will be used for the next transaction
Mvcc_op_log_lsa VARCHAR(32) The LSA used to link log entries for MVCC operation
Last_block_oldest_mvcc_id BIGINT Used to find the oldest MVCCID in a block of log data, can be NULL
Last_block_newest_mvcc_id BIGINT Used to find the newest MVCCID in a block of log data, can be NULL

The following shows the examples of this syntax.

-- csql> ;line on
SHOW LOG HEADER;
<00001> Volume_id                      : -2
        Magic_symbol                   : 'CUBRID/LogActive'
        Magic_symbol_location          : 16
        Creation_time                  : 09:46:41.000 PM 05/23/2017
        Release                        : '10.0.0'
        Compatibility_disk_version     : '10'
        Db_page_size                   : 16384
        Log_page_size                  : 16384
        Shutdown                       : 0
        Next_trans_id                  : 17
        Num_avg_trans                  : 3
        Num_avg_locks                  : 30
        Num_active_log_pages           : 1279
        Db_charset                     : 3
        First_active_log_page          : 0
        Current_append                 : '(102|5776)'
        Checkpoint                     : '(101|7936)'
        Next_archive_page_id           : 0
        Active_physical_page_id        : 1
        Next_archive_num               : 0
        Last_archive_num_for_syscrashes: -1
        Last_deleted_archive_num       : -1
        Backup_lsa_level0              : '(-1|-1)'
        Backup_lsa_level1              : '(-1|-1)'
        Backup_lsa_level2              : '(-1|-1)'
        Log_prefix                     : 'mvccdb'
        Has_logging_been_skipped       : 0
        Perm_status                    : 'LOG_PSTAT_CLEAR'
        Backup_info_level0             : 'time: N/A'
        Backup_info_level1             : 'time: N/A'
        Backup_info_level2             : 'time: N/A'
        Ha_server_state                : 'idle'
        Ha_file                        : 'UNKNOWN'
        Eof_lsa                        : '(102|5776)'
        Smallest_lsa_at_last_checkpoint: '(101|7936)'
        Next_mvcc_id                   : 6
        Mvcc_op_log_lsa                : '(102|5488)'
        Last_block_oldest_mvcc_id      : 4
        Last_block_newest_mvcc_id      : 5
SHOW LOG HEADER OF 'demodb_lgat';
<00001> Volume_id                      : -2
        Magic_symbol                   : 'CUBRID/LogActive'
        Magic_symbol_location          : 16
        Creation_time                  : 09:46:41.000 PM 05/23/2017
        Release                        : '10.0.0'
        Compatibility_disk_version     : '10'
        Db_page_size                   : 16384
        Log_page_size                  : 16384
        Shutdown                       : 0
        Next_trans_id                  : 15
        Num_avg_trans                  : 3
        Num_avg_locks                  : 30
        Num_active_log_pages           : 1279
        Db_charset                     : 3
        First_active_log_page          : 0
        Current_append                 : '(101|8016)'
        Checkpoint                     : '(101|7936)'
        Next_archive_page_id           : 0
        Active_physical_page_id        : 1
        Next_archive_num               : 0
        Last_archive_num_for_syscrashes: -1
        Last_deleted_archive_num       : -1
        Backup_lsa_level0              : '(-1|-1)'
        Backup_lsa_level1              : '(-1|-1)'
        Backup_lsa_level2              : '(-1|-1)'
        Log_prefix                     : 'mvccdb'
        Has_logging_been_skipped       : 0
        Perm_status                    : 'LOG_PSTAT_CLEAR'
        Backup_info_level0             : 'time: N/A'
        Backup_info_level1             : 'time: N/A'
        Backup_info_level2             : 'time: N/A'
        Ha_server_state                : 'idle'
        Ha_file                        : 'UNKNOWN'
        Eof_lsa                        : '(101|8016)'
        Smallest_lsa_at_last_checkpoint: '(101|7936)'
        Next_mvcc_id                   : 4
        Mvcc_op_log_lsa                : '(-1|-1)'
        Last_block_oldest_mvcc_id      : NULL
        Last_block_newest_mvcc_id      : NULL

SHOW ARCHIVE LOG HEADER

It shows the header information of an archive log file.

SHOW ARCHIVE LOG HEADER OF file_name;

This query has the following columns:

Column name Type Description
Volume_id INT Identifier of log volume
Magic_symbol VARCHAR(32) Magic value for file/magic Unix utility
Magic_symbol_location INT Magic symbol location from log page
Creation_time DATETIME Database creation time
Next_trans_id BIGINT Next transaction identifier
Num_pages INT Number of pages in the archive log
First_page_id BIGINT Logical page id at physical location 1 in archive log
Archive_num INT The archive log number

The following shows the examples of this syntax.

-- csql> ;line on
SHOW ARCHIVE LOG HEADER OF 'demodb_lgar001';
<00001> Volume_id            : -20
        Magic_symbol         : 'CUBRID/LogArchive'
        Magic_symbol_location: 16
        Creation_time        : 04:42:28.000 PM 12/11/2013
        Next_trans_id        : 22695
        Num_pages            : 1278
        First_page_id        : 1278
        Archive_num          : 1

SHOW HEAP HEADER

It shows shows the header page of the table.

SHOW [ALL] HEAP HEADER OF table_name;
  • ALL: If “ALL” is given in syntax in the partition table, the basic table and its partitioned tables are shown.

This query has the following columns:

Column name Type Description
Class_name VARCHAR(256) Table name
Class_oid VARCHAR(64) Format: (volid|pageid|slotid)
Volume_id INT Volume identifier where the file reside
File_id INT File identifier
Header_page_id INT First page identifier (the header page)
Overflow_vfid VARCHAR(64) Overflow file identifier (if any)
Next_vpid VARCHAR(64) Next page (i.e., the 2nd page of heap file)
Unfill_space INT Stop inserting when page has run below this. leave it for updates
Estimates_num_pages BIGINT Estimation of number of heap pages.
Estimates_num_recs BIGINT Estimation of number of objects in heap
Estimates_avg_rec_len INT Estimation total length of records
Estimates_num_high_best INT Number of pages in the best array that we believe have at least HEAP_DROP_FREE_SPACE. When this number goes to zero and there are at least other HEAP_NUM_BEST_SPACESTATS best pages, we look for them
Estimates_num_others_high_best INT Total of other believed known best pages, which are not included in the best array and we believe they have at least HEAP_DROP_FREE_SPACE
Estimates_head INT Head of best circular array
Estimates_best_list VARCHAR(512) Format: ‘((best[0].vpid.volid|best[0].vpid.pageid), best[0].freespace), … , ((best[9].vpid.volid|best[9].vpid.pageid), best[9].freespace)’
Estimates_num_second_best INT Number of second best hints. The hints are in “second_best” array. They are used when finding new best pages.
Estimates_head_second_best INT Index of head of second best hints. A new second best hint will be stored on this index.
Estimates_num_substitutions INT Number of page substitutions. This will be used to insert a new second best page into second best hints.
Estimates_second_best_list VARCHAR(512) Format: ‘(second_best[0].vpid.volid|second_best[0].vpid.pageid), … , (second_best[9].vpid.volid|second_best[9].vpid.pageid)’
Estimates_last_vpid VARCHAR(64) Format: ‘(volid|pageid)’
Estimates_full_search_vpid VARCHAR(64) Format: ‘(volid|pageid)’

The following shows the examples of this syntax.

-- csql> ;line on
SHOW HEAP HEADER OF athlete;
<00001> Class_name                    : 'athlete'
        Class_oid                     : '(0|463|8)'
        Volume_id                     : 0
        File_id                       : 147
        Header_page_id                : 590
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(0|591)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 27
        Estimates_num_recs            : 6677
        Estimates_avg_rec_len         : 54
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 0
        Estimates_best_list           : '((0|826), 14516), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1),0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|826)'
        Estimates_full_search_vpid    : '(0|590)'
CREATE TABLE participant2 (
    host_year INT,
    nation CHAR(3),
    gold INT,
    silver INT,
    bronze INT
)
PARTITION BY RANGE (host_year) (
    PARTITION before_2000 VALUES LESS THAN (2000),
    PARTITION before_2008 VALUES LESS THAN (2008)
);
SHOW ALL HEAP HEADER OF participant2;
<00001> Class_name                    : 'participant2'
        Class_oid                     : '(0|467|6)'
        Volume_id                     : 0
        File_id                       : 374
        Header_page_id                : 940
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|940), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|940)'
        Estimates_full_search_vpid    : '(0|940)'
<00002> Class_name                    : 'participant2__p__before_2000'
        Class_oid                     : '(0|467|7)'
        Volume_id                     : 0
        File_id                       : 376
        Header_page_id                : 950
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|950), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|950)'
        Estimates_full_search_vpid    : '(0|950)'
<00003> Class_name                    : 'participant2__p__before_2008'
        Class_oid                     : '(0|467|8)'
        Volume_id                     : 0
        File_id                       : 378
        Header_page_id                : 960
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|960), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|960)'
        Estimates_full_search_vpid    : '(0|960)'
SHOW HEAP HEADER OF participant2__p__before_2008;
<00001> Class_name                    : 'participant2__p__before_2008'
        Class_oid                     : '(0|467|8)'
        Volume_id                     : 0
        File_id                       : 378
        Header_page_id                : 960
        Overflow_vfid                 : '(-1|-1)'
        Next_vpid                     : '(-1|-1)'
        Unfill_space                  : 1635
        Estimates_num_pages           : 1
        Estimates_num_recs            : 0
        Estimates_avg_rec_len         : 0
        Estimates_num_high_best       : 1
        Estimates_num_others_high_best: 0
        Estimates_head                : 1
        Estimates_best_list           : '((0|960), 16308), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0), ((-1|-1), 0)'
        Estimates_num_second_best     : 0
        Estimates_head_second_best    : 0
        Estimates_tail_second_best    : 0
        Estimates_num_substitutions   : 0
        Estimates_second_best_list    : '(-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1), (-1|-1)'
        Estimates_last_vpid           : '(0|960)'
        Estimates_full_search_vpid    : '(0|960)'

SHOW HEAP CAPACITY

It shows the capacity of the table.

SHOW [ALL] HEAP CAPACITY OF table_name;
  • ALL: If “all” is given in syntax, the basic table and its partition table(s) is shown.

This query has the following columns:

Column name Type Description
Table_name VARCHAR(256) Table name
Class_oid VARCHAR(64) Heap file descriptor
Volume_id INT Volume identifier where the file reside
File_id INT File identifier
Header_page_id INT First page identifier (the header page)
Num_recs BIGINT Total Number of objects
Num_relocated_recs BIGINT Number of relocated records
Num_overflowed_recs BIGINT Number of big records
Num_pages BIGINT Total number of heap pages
Avg_rec_len INT Average object length
Avg_free_space_per_page INT Average free space per page
Avg_free_space_per_page_without_last_page INT Average free space per page without taking in consideration last page
Avg_overhead_per_page INT Average overhead per page
Repr_id INT Currently cached catalog column info
Num_total_attrs INT total number of columns
Num_fixed_width_attrs INT Number of the fixed width columns
Num_variable_width_attrs INT Number of variable width columns
Num_shared_attrs INT Number of shared columns
Num_class_attrs INT Number of table columns
Total_size_fixed_width_attrs INT Total size of the fixed width columns

The following shows the examples of this syntax.

-- csql> ;line on
SHOW HEAP CAPACITY OF athlete;
<00001> Table_name                              : 'athlete'
        Class_oid                               : '(0|463|8)'
        Volume_id                               : 0
        File_id                                 : 147
        Header_page_id                          : 590
        Num_recs                                : 6677
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 27
        Avg_rec_len                             : 53
        Avg_free_space_per_page                 : 2139
        Avg_free_space_per_page_except_last_page: 1663
        Avg_overhead_per_page                   : 993
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 3
        Num_variable_width_attrs                : 2
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 8
SHOW ALL HEAP CAPACITY OF participant2;
<00001> Table_name                              : 'participant2'
        Class_oid                               : '(0|467|6)'
        Volume_id                               : 0
        File_id                                 : 374
        Header_page_id                          : 940
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20
<00002> Table_name                              : 'participant2__p__before_2000'
        Class_oid                               : '(0|467|7)'
        Volume_id                               : 0
        File_id                                 : 376
        Header_page_id                          : 950
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20
<00003> Table_name                              : 'participant2__p__before_2008'
        Class_oid                               : '(0|467|8)'
        Volume_id                               : 0
        File_id                                 : 378
        Header_page_id                          : 960
        Num_recs                                : 0
        Num_relocated_recs                      : 0
        Num_overflowed_recs                     : 0
        Num_pages                               : 1
        Avg_rec_len                             : 0
        Avg_free_space_per_page                 : 16016
        Avg_free_space_per_page_except_last_page: 0
        Avg_overhead_per_page                   : 4
        Repr_id                                 : 1
        Num_total_attrs                         : 5
        Num_fixed_width_attrs                   : 5
        Num_variable_width_attrs                : 0
        Num_shared_attrs                        : 0
        Num_class_attrs                         : 0
        Total_size_fixed_width_attrs            : 20

SHOW SLOTTED PAGE HEADER

It shows the header information of specified slotted page.

SHOW SLOTTED PAGE HEADER { WHERE|OF } VOLUME = volume_num AND PAGE = page_num;

This query has the following columns:

Column name Type Description
Volume_id INT Volume id of the page
Page_id INT page id of the page
Num_slots INT Number of allocated slots for the page
Num_records INT Number of records on page
Anchor_type VARCHAR(32) One of flowing: ANCHORED, ANCHORED_DONT_REUSE_SLOTS, UNANCHORED_ANY_SEQUENCE, UNANCHORED_KEEP_SEQUENCE
Alignment VARCHAR(8) Alignment for records, one of flowing: CHAR, SHORT, INT, DOUBLE
Total_free_area INT Total free space on page
Contiguous_free_area INT Contiguous free space on page
Free_space_offset INT Byte offset from the beginning of the page to the first free byte area on the page
Need_update_best_hint INT True if saving is need for recovery (undo)
Is_saving INT True if we should update best pages hint for this page.
Flags INT Flag value of the page

The following shows the examples of this syntax.

-- csql> ;line on
SHOW SLOTTED PAGE HEADER OF VOLUME=0 AND PAGE=140;
<00001> Volume_id            : 0
        Page_id              : 140
        Num_slots            : 3
        Num_records          : 3
        Anchor_type          : 'ANCHORED_DONT_REUSE_SLOTS'
        Alignment            : 'INT'
        Total_free_area      : 15880
        Contiguous_free_area : 15880
        Free_space_offset    : 460
        Need_update_best_hint: 1
        Is_saving            : 0
        Flags                : 0

SHOW SLOTTED PAGE SLOTS

It shows the information of all slots in the specified slotted page.

SHOW SLOTTED PAGE SLOTS { WHERE|OF } VOLUME = volume_num AND PAGE = page_num;

This query has the following columns:

Column name Type Description
Volume_id INT Volume id of the page
Page_id INT Page id of the page
Slot_id INT The slot id
Offset INT Byte offset from the beginning of the page to the beginning of the record
Type VARCHAR(32) Record type, one of flowing: REC_UNKNOWN, REC_ASSIGN_ADDRESS, REC_HOME, REC_NEWHOME, REC_RELOCATION, REC_BIGONE, REC_MARKDELETED, REC_DELETED_WILL_REUSE
Length INT Length of record
Waste INT Whether or not wasted

The following shows the examples of this syntax.

-- csql> ;line on
SHOW SLOTTED PAGE HEADER OF VOLUME=0 AND PAGE=140;
<00001> Volume_id: 0
        Page_id  : 140
        Slot_id  : 0
        Offset   : 40
        Type     : 'HOME'
        Length   : 292
        Waste    : 0
<00002> Volume_id: 0
        Page_id  : 140
        Slot_id  : 1
        Offset   : 332
        Type     : 'HOME'
        Length   : 64
        Waste    : 0
<00003> Volume_id: 0
        Page_id  : 140
        Slot_id  : 2
        Offset   : 396
        Type     : 'HOME'
        Length   : 64
        Waste    : 0

SHOW INDEX HEADER

It shows the index header page of the index of the table.

SHOW INDEX HEADER OF table_name.index_name;

If ALL keyword is used and an index name is omitted, it shows the entire headers of the indexes of the table.

SHOW ALL INDEXES HEADER OF table_name;

This query has the following columns:

Column name Type Description
Table_name VARCHAR(256) Table name
Index_name VARCHAR(256) Index name
Btid VARCHAR(64) BTID (volid|fileid|root_pageid)
Node_level INT Node level (1 for LEAF, 2 or more for NON_LEAF)
Max_key_len INT Maximum key length for the subtree
Num_oids INT Number of OIDs stored in the Btree
Num_nulls INT Number of NULLs (they aren’t stored)
Num_keys INT Number of unique keys in the Btree
Topclass_oid VARCHAR(64) Topclass oid or NULL OID (non unique index)(volid|pageid|slotid)
Unique INT Unique or non-unique
Overflow_vfid VARCHAR(32) VFID (volid|fileid)
Key_type VARCHAR(256) Type name
Columns VARCHAR(256) the list of columns which consists of the index

The following shows the examples of this syntax.

-- Prepare test environment
CREATE TABLE tbl1(a INT, b VARCHAR(5));
CREATE INDEX index_ab ON tbl1(a ASC, b DESC);
-- csql> ;line on
SHOW INDEX HEADER OF tbl1.index_ab;
<00001> Table_name   : 'tbl1'
        Index_name   : 'index_a'
        Btid         : '(0|378|950)'
        Node_type    : 'LEAF'
        Max_key_len  : 0
        Num_oids     : -1
        Num_nulls    : -1
        Num_keys     : -1
        Topclass_oid : '(0|469|4)'
        Unique       : 0
        Overflow_vfid: '(-1|-1)'
        Key_type     : 'midxkey(integer,character varying(5))'
        Columns      : 'a,b DESC'

SHOW INDEX CAPACITY

It shows the index capacity of the index of the table.

SHOW INDEX CAPACITY OF table_name.index_name;

If ALL keyword is used and an index name is omitted, it shows the entire capacity of the indexes of the table.

SHOW ALL INDEXES CAPACITY OF table_name;

This query has the following columns:

Column name Type Description
Table_name VARCHAR(256) Table name
Index_name VARCHAR(256) Index name
Btid VARCHAR(64) BTID (volid|fileid|root_pageid)
Num_distinct_key INT Distinct key count (in leaf pages)
Total_value INT Total number of values stored in tree
Avg_num_value_per_key INT Average number of values (OIDs) per key
Num_leaf_page INT Leaf page count
Num_non_leaf_page INT NonLeaf page count
Num_total_page INT Total page count
Height INT Height of the tree
Avg_key_len INT Average key length
Avg_rec_len INT Average page record length
Total_space VARCHAR(64) Total space occupied by index
Total_used_space VARCHAR(64) Total used space in index
Total_free_space VARCHAR(64) Total free space in index
Avg_num_page_key INT Average page key count (in leaf pages)
Avg_page_free_space VARCHAR(64) Average page free space

The following shows the examples of this syntax.

-- Prepare test environment
CREATE TABLE tbl1(a INT, b VARCHAR(5));
CREATE INDEX index_a ON tbl1(a ASC);
CREATE INDEX index_b ON tbl1(b ASC);
-- csql> ;line on
SHOW INDEX CAPACITY OF tbl1.index_a;
<00001> Table_name           : 'tbl1'
        Index_name           : 'index_a'
        Btid                 : '(0|378|950)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '116.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'
SHOW ALL INDEXES CAPACITY OF tbl1;
<00001> Table_name           : 'tbl1'
        Index_name           : 'index_a'
        Btid                 : '(0|378|950)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '116.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'
<00002> Table_name           : 'tbl1'
        Index_name           : 'index_b'
        Btid                 : '(0|381|960)'
        Num_distinct_key     : 0
        Total_value          : 0
        Avg_num_value_per_key: 0
        Num_leaf_page        : 1
        Num_non_leaf_page    : 0
        Num_total_page       : 1
        Height               : 1
        Avg_key_len          : 0
        Avg_rec_len          : 0
        Total_space          : '16.0K'
        Total_used_space     : '120.0B'
        Total_free_space     : '15.9K'
        Avg_num_page_key     : 0
        Avg_page_free_space  : '15.9K'

SHOW CRITICAL SECTIONS

Total critical section (hereafter CS) information of a database is shown.

SHOW CRITICAL SECTIONS;

This query has the following columns:

Column name Type Description
Index INT The index of CS
Name VARCHAR(32) The name of CS
Num_holders VARCHAR(16) The number of CS holders. This has one of these values: ‘N readers’, ‘1 writer’, ‘none’
Num_waiting_readers INT The number of waiting readers
Num_waiting_writers INT The number of waiting writers
Owner_thread_index INT The thread index of CS owner writer, NULL if no owner
Owner_tran_index INT Transaction index of CS owner writer, NULL if no owner
Total_enter_count BIGINT Total count of enterers
Total_waiter_count BIGINT Total count of waiters
Waiting_promoter_thread_index INT The thread index of waiting promoter, NULL if no waiting promoter
Max_waiting_msecs NUMERIC(10,3) Maximum waiting time (millisecond)
Total_waiting_msecs NUMERIC(10,3) Total waiting time (millisecond)

The following shows the examples of this syntax.

SHOW CRITICAL SECTIONS;
Index  Name                       Num_holders           Num_waiting_readers  Num_waiting_writers  Owner_thread_index  Owner_tran_index     Total_enter_count    Total_waiter_count  Waiting_promoter_thread_index  Max_waiting_msecs     Total_waiting_msecs
============================================================================================================================================================================================================================================================
    0  'ER_LOG_FILE'              'none'                                  0                    0                NULL              NULL                   217                     0                           NULL  0.000                 0.000
    1  'ER_MSG_CACHE'             'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    2  'WFG'                      'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    3  'LOG'                      'none'                                  0                    0                NULL              NULL                    11                     0                           NULL  0.000                 0.000
    4  'LOCATOR_CLASSNAME_TABLE'  'none'                                  0                    0                NULL              NULL                    33                     0                           NULL  0.000                 0.000
    5  'QPROC_QUERY_TABLE'        'none'                                  0                    0                NULL              NULL                     3                     0                           NULL  0.000                 0.000
    6  'QPROC_LIST_CACHE'         'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000
    7   'DISK_CHECK'              'none'                                  0                    0                NULL              NULL                     3                     0                           NULL  0.000                 0.000
    8  'CNV_FMT_LEXER'            'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    9  'HEAP_CHNGUESS'            'none'                                  0                    0                NULL              NULL                    10                     0                           NULL  0.000                 0.000
    10  'TRAN_TABLE'              'none'                                  0                    0                NULL              NULL                     7                     0                           NULL  0.000                 0.000
    11  'CT_OID_TABLE'            'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    12  'HA_SERVER_STATE'         'none'                                  0                    0                NULL              NULL                     2                     0                           NULL  0.000                 0.000
    13  'COMPACTDB_ONE_INSTANCE'  'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    14  'ACL'                     'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    15  'PARTITION_CACHE'         'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000
    16  'EVENT_LOG_FILE'          'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    17  'LOG_ARCHIVE'             'none'                                  0                    0                NULL              NULL                     0                     0                           NULL  0.000                 0.000
    18  'ACCESS_STATUS'           'none'                                  0                    0                NULL              NULL                     1                     0                           NULL  0.000                 0.000

SHOW TRANSACTION TABLES

It shows internal information of transaction descriptors which is internal data structure to manage each transaction. It only shows valid transactions and the result may not be a consistent snapshot of a transaction descriptor.

SHOW { TRAN | TRANSACTION } TABLES [ WHERE EXPR ];

This query has the following columns:

Column name Type Description
Tran_index INT Index on the transaction table or NULL for unassigned transaction descriptor slot
Tran_id INT Transaction Identifier
Is_loose_end INT 0 for Ordinary transactions, 1 for loose-end transactions
State VARCHAR(64) State of the transaction. Either one of the followings: ‘TRAN_RECOVERY’, ‘TRAN_ACTIVE’, ‘TRAN_UNACTIVE_COMMITTED’, ‘TRAN_UNACTIVE_WILL_COMMIT’, ‘TRAN_UNACTIVE_COMMITTED_WITH_POSTPONE’, ‘TRAN_UNACTIVE_ABORTED’, ‘TRAN_UNACTIVE_UNILATERALLY_ABORTED’, ‘TRAN_UNACTIVE_2PC_PREPARE’, ‘TRAN_UNACTIVE_2PC_COLLECTING_PARTICIPANT_VOTES’, ‘TRAN_UNACTIVE_2PC_ABORT_DECISION’, ‘TRAN_UNACTIVE_2PC_COMMIT_DECISION’, ‘TRAN_UNACTIVE_COMMITTED_INFORMING_PARTICIPANTS’, ‘TRAN_UNACTIVE_ABORTED_INFORMING_PARTICIPANTS’,’TRAN_STATE_UNKNOWN’
Isolation VARCHAR(64) Isolation level of the transaction. Either one of the followings: ‘SERIALIZABLE’, ‘REPEATABLE READ’, ‘COMMITTED READ’, ‘TRAN_UNKNOWN_ISOLATION’
Wait_msecs INT Wait until this number of milliseconds for locks.
Head_lsa VARCHAR(64) First log address of transaction.
Tail_lsa VARCHAR(64) Last log record address of transaction.
Undo_next_lsa VARCHAR(64) Next log record address of transaction for UNDO purposes.
Postpone_next_lsa VARCHAR(64) Next address of a postpone record to be executed.
Savepoint_lsa VARCHAR(64) Address of last save-point.
Topop_lsa VARCHAR(64) Address of last top operation.
Tail_top_result_lsa VARCHAR(64) Address of last partial abort/commit.
Client_id INT Unique identifier of client application bind to transaction.
Client_type VARCHAR(40) Type of the client. Either one of the followings: ‘SYSTEM_INTERNAL’, ‘DEFAULT’, ‘CSQL’, ‘READ_ONLY_CSQL’, ‘BROKER’, ‘READ_ONLY_BROKER’, ‘SLAVE_ONLY_BROKER’, ‘ADMIN_UTILITY’, ‘ADMIN_CSQL’, ‘LOG_COPIER’, ‘LOG_APPLIER’, ‘RW_BROKER_REPLICA_ONLY’, ‘RO_BROKER_REPLICA_ONLY’, ‘SO_BROKER_REPLICA_ONLY’, ‘ADMIN_CSQL_WOS’, ‘UNKNOWN’
Client_info VARCHAR(256) General information of client application.
Client_db_user VARCHAR(40) Current login database account from client application.
Client_program VARCHAR(256) Program name of client application.
Client_login_user VARCHAR(16) Current login user of OS which running the client application.
Client_host VARCHAR(64) Host name of client application.
Client_pid INT Process id of client application.
Topop_depth INT Depth of nested top operation.
Num_unique_btrees INT Number of unique btrees contained in unique_stat_info array.
Max_unique_btrees INT Size of unique_stat_info_array.
Interrupt INT The flag of whether or not interrupt current transaction. 0 for No, 1 for Yes.
Num_transient_classnames INT Number of transient classnames by this transaction.
Repl_max_records INT Capacity of replication record array.
Repl_records VARCHAR(20) Replication record buffer array, display address pointer as 0x12345678 or NULL for 0x00000000.
Repl_current_index INT Current position of replication record in the array.
Repl_append_index INT Current position of appended record in the array.
Repl_flush_marked_index INT Index of flush marked replication record at first.
Repl_insert_lsa VARCHAR(64) Insert Replication target LSA.
Repl_update_lsa VARCHAR(64) Update Replication target LSA.
First_save_entry VARCHAR(20) First save entry for the transaction, display address pointer as 0x12345678 or NULL for 0x00000000.
Tran_unique_stats VARCHAR(20) Local statistical info for multiple row. display address pointer as 0x12345678 or NULL for 0x00000000.
Modified_class_list VARCHAR(20) List of dirty classes, display address pointer as 0x12345678 or NULL for 0x00000000.
Num_temp_files INT Number of temporary files.
Waiting_for_res VARCHAR(20) Waiting resource. Just display address pointer as 0x12345678 or NULL for 0x00000000.
Has_deadlock_priority INT Whether or not have deadlock priority. 0 for No, 1 for Yes.
Suppress_replication INT Suppress writing replication logs when flag is set.
Query_timeout DATETIME A query should be executed before query_timeout time or NULL for waiting until query complete.
Query_start_time DATETIME Current query start time or NULL for query completed.
Tran_start_time DATETIME Current transaction start time or NULL for transaction completed.
Xasl_id VARCHAR(64) vpid:(volid|pageid),vfid:(volid|pageid) or NULL for query completed.
Disable_modifications INT Disable modification if greater than zero.
Abort_reason VARCHAR(40) Reason of transaction aborted. Either one of the followings: ‘NORMAL’, ‘ABORT_DUE_TO_DEADLOCK’, ‘ABORT_DUE_ROLLBACK_ON_ESCALATION’

The following shows the examples of the statement.

SHOW TRAN TABLES WHERE CLIENT_TYPE = 'CSQL';
=== <Result of SELECT Command in Line 1> ===

<00001> Tran_index              : 1
        Tran_id                 : 58
        Is_loose_end            : 0
        State                   : 'ACTIVE'
        Isolation               : 'COMMITTED READ'
        Wait_msecs              : -1
        Head_lsa                : '(-1|-1)'
        Tail_lsa                : '(-1|-1)'
        Undo_next_lsa           : '(-1|-1)'
        Postpone_next_lsa       : '(-1|-1)'
        Savepoint_lsa           : '(-1|-1)'
        Topop_lsa               : '(-1|-1)'
        Tail_top_result_lsa     : '(-1|-1)'
        Client_id               : 108
        Client_type             : 'CSQL'
        Client_info             : ''
        Client_db_user          : 'PUBLIC'
        Client_program          : 'csql'
        Client_login_user       : 'cubrid'
        Client_host             : 'cubrid001'
        Client_pid              : 13190
        Topop_depth             : 0
        Num_unique_btrees       : 0
        Max_unique_btrees       : 0
        Interrupt               : 0
        Num_transient_classnames: 0
        Repl_max_records        : 0
        Repl_records            : NULL
        Repl_current_index      : 0
        Repl_append_index       : -1
        Repl_flush_marked_index : -1
        Repl_insert_lsa         : '(-1|-1)'
        Repl_update_lsa         : '(-1|-1)'
        First_save_entry        : NULL
        Tran_unique_stats       : NULL
        Modified_class_list     : NULL
        Num_temp_files          : 0
        Waiting_for_res         : NULL
        Has_deadlock_priority   : 0
        Suppress_replication    : 0
        Query_timeout           : NULL
        Query_start_time        : 03:10:11.425 PM 02/04/2016
        Tran_start_time         : 03:10:11.425 PM 02/04/2016
        Xasl_id                 : 'vpid: (32766|50), vfid: (32766|43)'
        Disable_modifications   : 0
        Abort_reason            : 'NORMAL'

SHOW THREADS

It shows internal information of each thread. The results are sorted by “Index” column with ascending order and may not be a consistent snapshot of thread entries. The statement under SA MODE shows an empty result.

SHOW THREADS [ WHERE EXPR ];

This query has the following columns:

Column name Type Description
Index INT Thread entry index.
Jobq_index INT Job queue index only for worker threads. NULL for non-worker threads.
Thread_id BIGINT Thread id.
Tran_index INT Transaction index to which this thread belongs. If no related tran index, NULL.
Type VARCHAR(8) Thread type. Either one of the followings: ‘MASTER’, ‘SERVER’, ‘WORKER’, ‘DAEMON’, ‘VACUUM_MASTER’, ‘VACUUM_WORKER’, ‘NONE’, ‘UNKNOWN’.
Status VARCHAR(8) Thread status. Either one of the followings: ‘DEAD’, ‘FREE’, ‘RUN’, ‘WAIT’, ‘CHECK’.
Resume_status VARCHAR(32) Resume status. Either one of the followings: ‘RESUME_NONE’, ‘RESUME_DUE_TO_INTERRUPT’, ‘RESUME_DUE_TO_SHUTDOWN’, ‘PGBUF_SUSPENDED’, ‘PGBUF_RESUMED’, ‘JOB_QUEUE_SUSPENDED’, ‘JOB_QUEUE_RESUMED’, ‘CSECT_READER_SUSPENDED’, ‘CSECT_READER_RESUMED’, ‘CSECT_WRITER_SUSPENDED’, ‘CSECT_WRITER_RESUMED’, ‘CSECT_PROMOTER_SUSPENDED’, ‘CSECT_PROMOTER_RESUMED’, ‘CSS_QUEUE_SUSPENDED’, ‘CSS_QUEUE_RESUMED’, ‘QMGR_ACTIVE_QRY_SUSPENDED’, ‘QMGR_ACTIVE_QRY_RESUMED’, ‘QMGR_MEMBUF_PAGE_SUSPENDED’, ‘QMGR_MEMBUF_PAGE_RESUMED’, ‘HEAP_CLSREPR_SUSPENDED’, ‘HEAP_CLSREPR_RESUMED’, ‘LOCK_SUSPENDED’, ‘LOCK_RESUMED’, ‘LOGWR_SUSPENDED’, ‘LOGWR_RESUMED’
Net_request VARCHAR(64) The net request name in net_requests array, such as: ‘LC_ASSIGN_OID’. If not request name, shows NULL
Conn_client_id INT Client id whom this thread is responding, if no client id, shows NULL
Conn_request_id INT Request id which this thread is processing, if no request id, shows NULL
Conn_index INT Connection index, if not connection index, shows NULL
Last_error_code INT Last error code
Last_error_msg VARCHAR(256) Last error message, if message length is more than 256, it will be truncated, If no error message, shows NULL
Private_heap_id VARCHAR(20) The address of id of thread private memory allocator, such as: 0x12345678. If no related heap id, shows NULL.
Query_entry VARCHAR(20) The address of the QMGR_QUERY_ENTRY*, such as: 0x12345678, if no related QMGR_QUERY_ENTRY, shows NULL.
Interrupted INT 0 or 1, is this request/transaction interrupted
Shutdown INT 0 or 1, is server going down?
Check_interrupt INT 0 or 1
Wait_for_latch_promote INT 0 or 1, whether this thread is waiting for latch promotion.
Lockwait_blocked_mode VARCHAR(24) Lockwait blocked mode. Either one of the followings: ‘NULL_LOCK’, ‘IS_LOCK’, ‘S_LOCK’, ‘IS_LOCK’, ‘IX_LOCK’, ‘SIX_LOCK’, ‘X_LOCK’, ‘SCH_M_LOCK’, ‘UNKNOWN’
Lockwait_start_time DATETIME Start blocked time, if not in blocked state, shows NULL
Lockwait_msecs INT Time in milliseconds, if not in blocked state, shows NULL
Lockwait_state VARCHAR(24) The lock wait state such as: ‘SUSPENDED’, ‘RESUMED’, ‘RESUMED_ABORTED_FIRST’, ‘RESUMED_ABORTED_OTHER’, ‘RESUMED_DEADLOCK_TIMEOUT’, ‘RESUMED_TIMEOUT’, ‘RESUMED_INTERRUPT’. If not in blocked state, shows NULL
Next_wait_thread_index INT The next wait thread index, if not exist, shows NULL
Next_tran_wait_thread_index INT The next wait thread index in lock manager, if not exist, shows NULL
Next_worker_thread_index INT The next worker thread index in css_Job_queue.worker_thrd_list, if not exist, shows NULL

The following shows the examples of the statement.

SHOW THREADS WHERE RESUME_STATUS != 'RESUME_NONE' AND STATUS != 'FREE';
=== <Result of SELECT Command in Line 1> ===
<00001> Index                      : 183
        Jobq_index                 : 3
        Thread_id                  : 140077788813056
        Tran_index                 : 3
        Type                       : 'WORKER'
        Status                     : 'RUN'
        Resume_status              : 'JOB_QUEUE_RESUMED'
        Net_request                : 'QM_QUERY_EXECUTE'
        Conn_client_id             : 108
        Conn_request_id            : 196635
        Conn_index                 : 3
        Last_error_code            : 0
        Last_error_msg             : NULL
        Private_heap_id            : '0x02b3de80'
        Query_entry                : '0x7f6638004cb0'
        Interrupted                : 0
        Shutdown                   : 0
        Check_interrupt            : 1
        Wait_for_latch_promote     : 0
        Lockwait_blocked_mode      : NULL
        Lockwait_start_time        : NULL
        Lockwait_msecs             : NULL
        Lockwait_state             : NULL
        Next_wait_thread_index     : NULL
        Next_tran_wait_thread_index: NULL
        Next_worker_thread_index   : NULL
<00002> Index                      : 192
        Jobq_index                 : 2
        Thread_id                  : 140077779339008
        Tran_index                 : 2
        Type                       : 'WORKER'
        Status                     : 'WAIT'
        Resume_status              : 'LOCK_SUSPENDED'
        Net_request                : 'LC_FIND_LOCKHINT_CLASSOIDS'
        Conn_client_id             : 107
        Conn_request_id            : 131097
        Conn_index                 : 2
        Last_error_code            : 0
        Last_error_msg             : NULL
        Private_heap_id            : '0x02bcdf10'
        Query_entry                : NULL
        Interrupted                : 0
        Shutdown                   : 0
        Check_interrupt            : 1
        Wait_for_latch_promote     : 0
        Lockwait_blocked_mode      : 'SCH_S_LOCK'
        Lockwait_start_time        : 10:47:45.000 AM 02/03/2016
        Lockwait_msecs             : -1
        Lockwait_state             : 'SUSPENDED'
        Next_wait_thread_index     : NULL
        Next_tran_wait_thread_index: NULL
        Next_worker_thread_index   : NULL

SHOW JOB QUEUES

It shows the status of job queue. The statement under SA MODE shows an empty result.

SHOW JOB QUEUES;

This query has the following columns:

Column name Type Description
Jobq_index INT The index of job queue
Num_total_workers INT Total number of work threads of the queue
Num_busy_workers INT The number of busy worker threads of the queue
Num_connection_workers INT The number of connection worker threads of the queue